My Mac locked

Hi there,

try this

After you enter a password up to three times, your Mac should show one of these password-reset options.

Option 1: Restart and show password options

1. If you see the option to restart and show password reset options, click it to restart your Mac. Then take one of these steps:

• • Sign in with your Apple ID, if asked. You might also be asked to enter the verification code sent to your other devices.
  • Enter your FileVault recovery key, if asked. It's the long string of letters and numbers you received when you turned on FileVault and chose to create a recovery key instead of allowing your iCloud account (Apple ID) to unlock your disk.

1. Select a user that you want to reset the password for, then click Next.
2. Enter your new password information, then click Next. 
3. When the password reset is completed, click Restart.

Option 2: Reset using your Apple ID

1. If you see the option to reset using your Apple ID, click it.

• • If your Mac restarts, follow the steps for option 1, above.
  • If your Mac doesn't restart, but immediately asks for your Apple ID, enter that information and click Reset Password.

1. If you're asked to create a new keychain to store the user's passwords, click OK to restart your Mac.
2. If you're asked to select an admin user you know the password for, click “Forgot all passwords?”.
3. If you see a Reset Password window with the option to Deactivate Mac, click Deactivate Mac, then click Deactivate to confirm. This is temporary.
4. Enter your new password information, then click Next.
5. If this window shows multiple user accounts, click the Set Password button next to each account name, then enter the new password information for each account.
6. When the password reset is completed, click Restart.

Option 3: Reset using your recovery key

1. Click the option to reset using your recovery key.
2. Enter your FileVault recovery key. It's the long string of letters and numbers you received when you turned on FileVault and chose to create a recovery key instead of allowing your iCloud account (Apple ID) to unlock your disk.
3. Enter your new password information, then click Reset Password.

If you cannot Reset your password this way, see this link and follow the instructions provided

https://support.apple.com/kb/HT212190